single trigger Bass trombone made by Holton model TR185 this bass trombone the bell is 10 inch not 9 1/2 the horn is excellent condition for the vintage this horn is very hard to find do 10 inch bell the slide is excellent no red spot or wear at all no dent .very fast action this horn is all original never be to the repair shop. am second owner do the i have another 185 double trigger 9 1/2 inch bell i will try to find a home for this one price is 1600 plus shipping only in the USA :hi: